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389 Directory Server is an open-source LDAPv3 directory server for Linux. It gives applications and systems a shared place to look up structured information such as users, groups, contact details, certificates, and organizational data. It is a fit when multiple clients need consistent access to information that is read often and does not change constantly; it can also support Linux server and workstation authentication through LDAP-aware clients such as SSSD.
What 389 Directory Server does
The 389 Directory Server project describes LDAP as a protocol for representing objects in a network database, commonly including identities, groups, and organizational information. The server provides that directory service on Linux and supports LDAPv3. Its project homepage calls it “The enterprise-class Open Source LDAP server for Linux.” That is the project’s positioning, not a published independent benchmark.
A directory is not simply a general-purpose database for every application workload. It is most useful for structured, shared information that clients look up frequently and that changes relatively infrequently. The project’s getting-started guide names contact details, passwords, certificates, and relatively static business data as examples.
When a directory is useful
Centralized identity and group data
Instead of maintaining separate user and group records in every service, an organization can make directory entries available to multiple LDAP-capable clients. The value depends on those clients being configured to use the directory; installing the server alone does not centralize authentication or user management.
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- Micro-ATX (9.6"x 9.6")
- Support AMD Ryzen 7000 series Processors
- 4 DIMM slots (2DPC), supports DDR5 ECC/non-ECC UDIMM
- 1 PCIe5.0 x16, 1 PCIe5.0 x4, 1 PCIe4.0 x1
- Supports 1 M.2 (PCIe5.0 x4)
Linux authentication
The project identifies Linux server and workstation authentication as a major LDAP use case and points administrators to its SSSD integration guidance. Check that the Linux systems and services you need to support can use the client integration you plan to deploy, and follow the current guidance for those systems.
Data that changes frequently
Because the project recommends directories for information that changes infrequently but is read often, a workload dominated by frequent updates may be a poor fit. Decide which records belong in the directory and which should remain in an application’s own data store before choosing a deployment design.
Rank #2
- LGA 2011-3 socket: This server motherboard supports Intel 5th/6th generation Core i7 processors and Xeon E5 V3/V4 series processors. (Eg. E5-1660 V3, E5-2695 V3, E5-1620 V4, E5-2690 V4, i7-5960X, i7-6900K, etc.)
- 8 DDR4 slots: The memory slots of this X99 motherboard are 4-channel design, compatible with ECC and non-ECC memory. The effective frequency is 2133/2400MHz, and the maximum capacity is 8*32GB
- Dual M.2: This ATX motherboard is equipped with flash NVME M.2 (PCIe 3.0 X4 bandwidth) and AHCI M.2 (SATA 6Gbps) slots, of which NVME M.2 maximum speed Up to 32Gbps
- 5 * PCIe Expansion Slots: The LGA 2011-3 motherboard is equipped with 2 * PCIe 3.0 X16 slots, 1 * PCIe 3.0 X4 slots(with steel casing) and 2 * PCIe 2.0 X1 slots. Each lane can support a rate of 8Gbps, and the rate of the X16 slot can reach 128Gbps. The 2 * X16 slots can be used together. The X1 slot can be used to expand the network card, sound card and hard disk
- Other powerful components: One-key on/off and one-key restart, VRM cooling fan, 7.1 channel audio, digital diagnostic card and 7.5*5.5cm aluminum alloy heat sink
Security and replication capabilities
Protecting connections
The project lists TLS and SASL among its security mechanisms. Its getting-started guide recommends TLS to protect passwords and identities in transit. Configure and verify TLS before clients send credentials or identity data over the network; the exact certificate and client steps depend on the deployed release and operating system.
Protecting selected stored attributes
The feature reference describes encryption at rest for attributes. This is distinct from TLS: TLS protects data moving between clients and the server, while attribute encryption concerns selected data stored by the directory. Neither mechanism, by itself, constitutes a complete security design.
Rank #3
- LGA 2011 Socket: The X79 Server motherboard support Intel LGA2011 socket CPU processors (e.g. Intel Xeon E5 1620/1660/2603/2620/2667/2690, E5 1603 V2/ 2620 V2/26340 V2/2670 V2/2695 V2, etc.)
- Dual-channel DDR3: The Intel LGA 2011 gaming motherboard supports DDR3 Desktop/ECC/RECC memory up to 256GB (4*64GB), and supports 1066/1333/1600Mhz
- Stable Power Supply: 8-phase power supply, all-solid-state capacitor design, fine workmanship, professional stability. And the DDR3 mainboard is equipped with 24+8 pin power interface (please use a brand power supply of at least 500w)
- Rich Interfaces: The Micro ATX placa madre features RJ45 gigabit network interfaces, and the maximum network transmission rate can reach 1000bps/s. And with M.2 slots (support NVME SSD/NGFF SSD), PCIe 3.0 X16, PCIe 2.0 x1, SATA 3.0, SATA 2.0, USB 3.0, USB 2.0
- Excellent performance: The DDR3 computer motherboard uses Intel X79 chipset and 8-layer PCB material. And with Heat dissipation armor protection for strong heat dissipation, to ensure stable bus communication
Multi-supplier replication
The project describes multi-supplier replication as allowing concurrent writes to two or more suppliers, with automatic conflict resolution. It is an option to evaluate when availability for reads and writes matters, not an automatic substitute for a recovery plan. Before deploying it, determine which systems will be suppliers, where they will be placed, what write availability is required, and how operators will handle conflicts and recovery.
Administration and operational planning
Online management
The feature reference says almost all configuration and management can be performed online over LDAP, including import, export, backup, and restore operations. It also describes administrative tasks invoked through a special task-entry area in the configuration directory. Use the documentation for the release you deploy to confirm the supported procedures and permissions.
Rank #4
- Intel Dual CPU Sockets: This C612 chipset server motherboard is designed with dual CPU sockets, which can support Xeon E5 V3/V4 series processors. (Note: Core i7 not support Dual-CPU mode, if only one CPU is installed, please install it in the left slot)
- DDR4 Memory Slots: The memory slots of the LGA 2011-v3 motherboard is designed with 8-channel, which can support DDR4, DDR4 ECC, DDR4 RECC RAM. It supports effective frequencies is 2133/2400MHz, and the maximum capacity is 256GB. (Note: When use E5 v4 CPU, can not support Desktop DDR4 RAM)
- PCIe 3.0 Protocol: Equipped with 2 PCIe 3.0 X16 graphics card slots (with steel case), and 1 PCIe 3.0 X8, 2 PCIe 2.0 X1. The transfer rate can reach 15.754 GB/s. Equipped with 2 M.2 hard disk slots, which can achieve fast reading even if multiple programs are running
- Stable Power Supply: The X99 Dual CPU motherboard use 24+8+8pin standard power supply interface, 8-phase power supply. Precise modularization provides good heat dissipation and makes the program run more stably
- Strong Expandability: The X99 gaming motherboard is equipped with multiple expansion interfaces to ensure that the motherboard has more room for improvement, include 4*USB 3.0 ports, 2*USB 2.0 ports, 8*SATA 3.0 ports, 2*network ports
Plugins, logs, and host limits
The project documents a C/C++ plugin interface and flexible logging. Its architecture guidance also notes that operating-system file descriptor limits can matter. Review logging needs and host limits on the target system as part of capacity planning; the available project material does not establish a universal performance figure or a workload-specific sizing recommendation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to approach a deployment
- Define the directory’s role. List the data to store, the clients that will read it, and whether Linux authentication is in scope. Confirm that the data is structured, shared, read frequently, and not constantly changing.
- Use release-specific installation guidance. Select instructions for the target Linux distribution and 389 Directory Server release. The project documentation index includes installation material and cautions that Red Hat Directory Server documentation can apply, but readers should check 389 DS release notes and the install guide for important differences.
- Set up TLS before client credentials flow. Use the applicable release documentation to configure TLS and verify clients connect securely before sending passwords or identity information.
- Configure clients deliberately. For Linux authentication, follow the project’s SSSD guidance and test the intended systems and login paths before relying on the directory in production.
- Choose a replication design. Decide whether a single supplier meets availability needs or whether multi-supplier replication is warranted. Document expected conflict handling, backup, restore, and recovery procedures.
- Prepare operations. Plan imports and exports, backups and restores, logging, and operating-system limits using current release and host documentation. Test recovery procedures rather than assuming replication is a backup.
Where to find current guidance
The project documentation index links to installation, TLS, replication, migration from OpenLDAP, operating-system integration, troubleshooting, and performance resources. Support details, install commands, and platform compatibility can vary by release and distribution; the material referenced here does not establish a current release number or support matrix. Check the release notes and installation guide for the version and system you intend to run.
389 Directory Server is downloadable without a purchase. The project documentation index also lists LDAP books for readers who want broader background, but no particular book is required to deploy the server.
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